| abstract |
Granules based on pyrogenically prepared silicon dioxide doped with aluminum oxide by means of an aerosol, which granules have the characteristic data: n mean particle diameter: from 10 to 150 μm BET surface area: from 25 to 100 m 2 /g pH value: from 3 to 6 tamped density: from 400 to 1200 g/l n n They are produced by dispersing in water pyrogenically prepared silicon dioxide doped with aluminum oxide by means of an aerosol, spray drying the dispersion, and optionally carrying out tempering and/or silanization. In the silanized form, the granules have the following characteristic data: n mean particle diameter: from 10 to 160 μm BET surface area: from 15 to 100 m 2 /g pH value: from 3 to 9 tamped density: from 400 to 1200 g/l carbon content: from 0.3 to 12.0 wt. % n n The granules are used inter alia as a catalyst and catalyst support, in cosmetics for sun-protection formulations, in silicone rubber, in toner powders, in paints and inks, as grinding and polishing agents, as a raw material for the production of glass and ceramics. |